LingoFonts is dedicated text-style generators instead of one page mixing everything together. Real font counts (verified against live output, not estimated), documented Unicode limitations (small caps has no true Q/X, most styles have no digit forms), and the underlying code-point mappings are open source on GitHub.
Built this solo as a long-term project, not a weekend hack. Happy to answer anything about the Unicode side — turns out "fancy text" has a surprising amount of undocumented weirdness (why does italic lowercase h use a totally different code block than the rest of the alphabet? Real answer, ask me).